make sure you arnt in the nodes aura range, or when you start messing with thaumcraft youre gonna get a LOT of flux, and probably some giant angry zombies.Thanks everyone for all the ideas.
In the end, I decided to glass in the dark node and built a simple water collection system which now moves the mobs to a central kill chamber. Plus since the mound is only a hundred or so blocks from my base, I have contained those pesky wisps, before they become a problem in the future.
Hence, he glassed in the node, to contain (almost) anything foul that it decides to spew forth. Except, of course, storms, lightning strikes, debuffs, Flux Goo (if that stuff is even in)...make sure you arnt in the nodes aura range, or when you start messing with thaumcraft youre gonna get a LOT of flux, and probably some giant angry zombies.
heck, youre probably gonna get a few anyway, the dark nodes always produce flux.